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Effect of Carbon Content on Cracking Phenomenon Occurring during Cold Rolling of Three Light-Weight Steel Plates

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Abstract

Effects of carbon content on cracking phenomenon, which often occurred in cold-rolled light-weight steel plates, were investigated in this study. Three steels were fabricated by varying carbon content, and their microstructures and tensile properties were investigated. The steel containing low carbon content of 0.1 wt pct consisted of thin κ-carbide bands, coarse band boundary κ-carbides, and ferrites. As the carbon content increased, volume fractions of κ-carbide bands and total κ-carbides increased, and band boundary κ-carbides were finely distributed in relatively wide band boundary areas. Microstructural observation of the deformed region of tensile specimens revealed that coarse κ-carbides continuously formed along band boundaries worked to initiate the cracking or to facilitate the abrupt crack propagation into ferrites or band boundaries in a cleavage fracture mode, while bands densely populated with fine, lamellar κ-carbides did not play a critical role in the cracking. Thus, the increase in carbon content effectively minimized the formation of band boundary carbides and reduced their size, thereby resulting in the prevention of cracking during cold rolling and in the simultaneous improvement of ductility and strength.

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  1. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

  2. INSTRON is a trademark of Special Metals Corporation, New Hartford, NY.

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Acknowledgments

This work was supported by POSCO under Contract No. 2008Y221. The authors thank Professor Byeong-Joo Lee and Mr. Chang-hyo Seo, POSTECH, for their help with the alloying effect and microstructural analysis.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials and the Materials Science and Engineering Department, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Seung Youb Han (Research Assistant), Sang Yong Shin (Research Professor) & Sunghak Lee (Professor)

  2. Graduate Institute of Ferrous Technology and the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Nack J. Kim (Professor)

  3. Technical Research Laboratories, POSCO, Kwangyang, 545-090, Korea

    Jai-Hyun Kwak (Senior Principal, Sheet Products & Process Research Group) & Kwang-Geun Chin (Senior Vice President)

Authors
  1. Seung Youb Han
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  2. Sang Yong Shin
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  3. Sunghak Lee
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  4. Nack J. Kim
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  6. Kwang-Geun Chin
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Correspondence to Sunghak Lee.

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Manuscript submitted April 9, 2010.

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Han, S.Y., Shin, S.Y., Lee, S. et al. Effect of Carbon Content on Cracking Phenomenon Occurring during Cold Rolling of Three Light-Weight Steel Plates. Metall Mater Trans A 42, 138–146 (2011). https://doi.org/10.1007/s11661-010-0456-3

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